ROOT Forum

Topic	Replies	Views	Activity
Newbie forum for when you're not sure News If you’re new to ROOT, C++, data analysis etc, and you hesitate to ask your question, then please ask it in the Newbie section, where nice people help and we have special rules to be more welcoming. Don’t hesitate, jus…	4	19299	February 19, 2025
Welcome to the ROOT forum! News	1	8208	February 10, 2017
Roofit: PDFs with different domain in the same model (e.g. gauss + lognormal) Roofit and RooStats	6	55	January 4, 2026
Shadow warnings on MacOS (CLang) were never fixed? ROOT	4	21	January 2, 2026
Are there any plans to backport the CMake 4.0.0 fixes (especially for subpackages) to earlier releases ROOT cmake	1	12	January 2, 2026
RDF Display width ROOT	1	11	January 1, 2026
Problems with buttons for advance, stop, and event selection in Event Display view in standalone code ROOT root	4	17	December 31, 2025
Charge Sharing Phenomenon between Collector and Guard Ring in GARFIELD Ionization Chamber Simulation Garfield++	2	19	December 30, 2025
Silent crash when adding key to nlohmann::json object with semicolon omitted ROOT bug , cling	1	20	December 25, 2025
Value_counts in RDataFrame Newbie python , rdataframe	2	18	December 25, 2025
Plus minus sign in a latex or a text Newbie	6	3248	December 24, 2025
Unexpected diffusion with AvalancheMC at high pressure (10 atm) for negative ions Garfield++	1	19	December 22, 2025
Multithreading in ROOT::Fit::Fitter::FitFCN? ROOT	3	26	January 2, 2026
Do I need to update ClassDef if I change the name of a variable Newbie	2	24	December 19, 2025
ODBC and MySQL connectivity with Root 6.36 (and beyond) ROOT	7	158	December 18, 2025
TGraph.Fit() usage with EnableImplicitMT(). Is TGraph.Fit() thread-safe? ROOT bug , rdataframe	2	24	December 31, 2025
How to can I use TMVA to draw the ROC curve and compute its AUC of a discriminative variable? TMVA	1	16	December 17, 2025
Can't built minimal ROOT 6.38.00 with X11 and asimage ROOT build , root	4	38	December 29, 2025
Feeding TMVA with TTrees for signal and backgrounds TMVA tree , hist , python , root , tmva	2	25	December 15, 2025
[CEA 48169] Windows + Numba: cppyy.sizeof('void*') Issue? Newbie python , root , windows	5	53	December 15, 2025
[CEA 48138][Windows 10] roottest: execHistArray redefinition error (3) ROOT windows	8	46	December 29, 2025
Drift Velocity Calculation in Garfield++ Garfield++	2	36	December 26, 2025
TClass::GetClass("MyClassName)->New() Fails ROOT root	7	27	December 25, 2025
JSROOT: Some RNTuples are not fully displayed ROOT jsroot	5	32	December 25, 2025
Empty RNode after a return Newbie	2	21	December 11, 2025
SetBranchStatus - third flag? Evolution Proposals, Apps & Ideas	1	24	December 11, 2025
Installing ROOT on Windows 11 Newbie installation	6	4204	December 11, 2025
Read a SQLite db file and convert it to TTree Newbie hist	5	33	December 11, 2025
PyROOT tries to import `.so` instead of `.dylib` on macos ROOT python , root , python3	2	17	December 15, 2025
The thisroot.sh misbahes in ROOT 6.34+ ROOT	12	75	December 23, 2025

Newbie forum for when you're not sure

If you’re new to ROOT, C++, data analysis etc, and you hesitate to ask your question, then please ask it in the Newbie section, where nice people help and we have special rules to be more welcoming. Don’t hesitate, jus…